Electric focusing-lamp



(N0 Model.)

0. J. VAN DEPOELE.

ELECTRIC FOGUSING LAMP.

No. 304,377. Patented Sept. 2, 1884.

UNITED STATES PATENT QFFICE.

CHARLES J. VAN DEPOELE, OF CHICAGO, ILLINOIS. I

ELECTRIC FOCUSlNG-LAMP.

SPECIFICATION forming part of Letters Patent No. 304,377, datedSeptember 2, 1884.

Application filed February 23, 1884. (No model.)

To aZZ whom it may concern.-

Be it known that 1, CHARLES J. VAN DE- roELE, a citizen of the UnitedStates, residing at Chicago, in the county'of Cook and State ofIllinois, have invented certain new and useful Improvements in ElectricFocusing-Lamps, of which the following is a specification, referencebeing had therein to the accompanying drawings.

My invention relates to a new and useful improvement made in electricarelamps of that class called foeusing-regulators;l and it consists,especially, in the construction of parts, as also in the arrangement ofthe electrio circuits, producing a steady feed of the carbon.

The following is a full description of the apparatus, reference beinghad to the annexed drawings, forming part of this specification.

Figure 1 is a side elevation of the lamp complete, with its sidesremoved, showing the motor, the gearing, the screw, 820. Fig. 2 is aplan view of the motor andbottom plate, as, as seen when the top 2 isremoved. Fig. 3 is 5 a plan view, looking over top of lamp, showing thebinding-posts, brush-holders, earbon-' holders, &c. Fig. 4 is a planview of top 2 when removed from lower part and turned up, showing thegear working the screw-feed, 85c.

Fig. 5 is an enlarged elevation of part of the screw, the guide-rod, thecarbon-holder, &G. Fig. 6 is a horizontal view of the carbon-carrier,&c. Fig. 7 is a diagram of circuits and connections in the lamp.

3 5 In the above figures similar letters refer to similar parts.

A is the armature; B, the brush. B and B are brush-holders; O,commutator. D is a suitable resistance placed in the main or car- 0 boncircuit of the lamp for the purpose of diverting the required proportionof current to the coils of the armature which are connected inderivttion therefrom; F, field-magnet; N and S, north and south poles offield-magnet;

5 0 0 0 0, four vpost-s holding top and bottom plates of lamp together.to is large gearwheel; '0, pinion driven by armature A, and engaging inw, driving the screw S, H and H, carbon-carriers provided withscrew-thread 5o worked by screw S. H has its front part insulated fromthe rear, a rod, 0 passing through proper opening in H, the latterprovided with a spring-contact, i, in order to insure good contactbetween these parts, which are connected to the negative pole of thelamp. G is 5 a guide to thescrew S. R is a standard, and at the sametime a guide-rod, keeping the carbon-carriers in perfect line with eachother. T is a part-nut held in place against the screw S by means ofspring s'whenever the lamp is in operation or otherwise, except when itis desirable to move the carbons independent from each other. By pullingT out of contact with S the carbon-carriers can be slipped either up ordown, since no thread is cut in the carbon-carrier, the screw passingloosely through the latter when disengaged from the part-nut T.

Fig. 7 indicates the circuits in the lamp as follows: The current entersat 1?; part of the current passes through resistance D and part througharmature to all metallic parts of lamp and to top carbon, from topcarbon to lower one, and by proper conductor back to N, or negativepole. The shunt around the field- 7'5 magnet is taken between the twopoles of the lamp, as usual.

In operation the lamp works as follows: 011 establishing the currentfrom a proper sourceby means of the posts N and l the carbons being incontactwith each other, the current will circulate through the armatureA, and the'current entering the latter, so as to react upon the poles ofthe field-magnet F,will cause the armature to revolve and separate thecar- 8 5 bons. Soon current enough will pass through the shunt aroundthe field-magnet F, so as to magnetize its poles with the same polarityas the revolving armature and oppose the further rotation of thearmature, preventing the 0 carbons from being unduly separated. New, onthe increased distance of the carbons, caused by their consumption, morecurrent will flow through the shunt around the field magnet, when,finally, it will repel the poles 5 in the armature and cause the latterto revolve in opposite direction from what it did at first, thus feedingthe carbons toward each other until a balance again exists between thefield-magnet and its armature, when feeding roo will be stopped untilthe distance between the carbons augments and feeding proceeds, as abovedescribed, and so on until the carbons are consumed.

The action of the motor is as follows: Supposing the carbons to be incontact, the moment we establish the current, at this period there is noperceptible current passin through the shunt-coils ot' the field magnet;conse quently the iron poles will beiniluenced by the magnetism in thearmature, and the brushes,

being appropriately placed with relation to the poles of theiield-1nagnet,will cause the armature to revolve in the directionindicated. by the arrows. (See Fig. 2.) This will cause the carbons tobe separated. More and more current will circulate through the coils ofthe field-magnet, (which are the usual high'resistance shunt around thearc,) magnetizing the latter with the same polarity as that in thearmature. Assoonasthepolesinthesaid fieldmagnet are magnetized to thesame degree as the poles of the armature, rotation will be pre vented.However, in a short time the dis tance between the carbons will augment,and soon the field-magnet poles will overbalance the magnetism in thearmature, producing repulsion between their respective poles, cansingthe armature to revolve in the opposite direction from what it did atfirst, when the carbons will be led down until the balance isreestablished. Thus it will be seen that the slightest variation of theare will be responded to by the motor, keeping the lightat all timesnormal. The screw-rod S has a right and left thread out upon it, and sopro mrlioned that the top carbon will be moved twice as fast as thelower one, to compensate for the unequal consumption of the carbons, andthus keep the luminous point at the same place. As above stated, thescrew-rod is titted loosely in the sleeves of the carbon-carriers, and apartnut is made to engage in the thread of the red when the points ofthe carbons have been put in proper relation with each other, so that bydisengaging the part-nutl from the rod S the carbon-carriers can bemoved either way without turning the rod Further, the rod S can beturned either way by a thumbbutton from its upper end, as seen in Fig.l, which enables the carbons to be moved toward or from each other byhand.

hat I claim as new, and desire to secure by Letters Patent, is

1. In an electric lamp, an electric motor having armaturecoils placed inderivation around a resistance located in the main eir cuit, and an ironfield-magnet energized by coils located in a derivation or shunt of highresistance spanning the arc of the lamp.

2. In an electric l'ocusinglamp, an electric motor consisting of anarmature energized by coils placed in a derivation around a resist ancein the main circuit, and a iield-magnet energized by coils of highresistance located in a derivation. around the arc of the lamp, andarranged substantially as described, whereby the armature is caused torevolve in a direction to separate the carbons until sufficient currentwill be diverted through the shunt, including the field-magnet, tomagnet-- ize the latter sulliciently to actuate the motor to feed thecarbons.

3. In a focusing electric lamp, the combination, with a fieldauagnctwouiul with coils of high resistance located in a shunt around the arc,of an armature wound with coils in a derivation around a resistancelocated in the main or carbon circuit, an oppositelythreadedsereiwshat't, carbon-holders detaehably and adjustably mounted on saidshaft, and connections between the armature and the shaltwhereby themovements of the armature are con'nnunicated to the carbon-holders.

4.. The combination, with the armature A and lield-nuignet 1*, suitablecommutator and brushes, and the coil 1), of carboirholdcrs H 11, mountedonsuitableguide-rod, It, and slotted at one side, and provided withpart-nuts T 'l, fitting said slots in the carboncarriers, and thescrew-shaft S, oppositely threaded at its upper and lower portion, thepitch of said upper portion, or that controlling the positive carbon,being sulliciently greater to maintain the point of ignition in apractically fixed position.

The combination, with armature A, fieldmagnct it, pinion '1, gear-wheel'10, and screwshaft $5, of suitable carbon holders iitting around saidscrew-shalt and provided with the movable portion forming part-nuts T T,as described.

G. The combination, with armature A, iieldmagnet l screw-shaft S, andconnections be tween said armature and shalt, ol' the carbonholders Illand ll, the latter being insulated from its support and provided withthe connecting-rod r, as described.

lntestimony whereof I allix mysignature in presence of two witnesses.

tjllAliCLllS J. VAN l)lOI?(')lDIJIG. Witimsses:

Nonna N 'l. ti ASSlG'llI, 'lnno. l. lhxlnnv.

